4.For some unknown function f(x), the first derivative of the function is given by f'(x)= 2cos(3x)-1. Show ALL the algebra/trig needed to find all intervals (in interval notation) where f(x) is increasing and all intervals where f(x) is decreasing on [0,2π). Include a sign graph of + and - signs to support your answer

to support your answer.

to support your answer.

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